Sound reproducing device



SOUND REPRODUC ING DEVICE Original Filed Nov. 19, 1929 Emu/"tom PatentedOch4, 1932 ',rarss SQUND REPRODUGING DEVICE Application filed November19, 1929, Serial No. 408,394. Renewed February 19, 1932.

The present invention relates to sound translating devices and moreespecially to im- I proved means for reproducing sound vibrationsrecorded on a film or the like. A. primary object, of the invention isto provide a revoluble member for receiving the fihnand frictionallymaintaining the same in proper: operative osition relative to theoptical systema-nd the light sensitive element, so that as the soundreproducing port-ion of the film passes a projected beam of light fromthe optical system, the acoustical modulated light'will cause thevariation of an electric current in accordance with the sound wavevariations accurately reproduce the sound recorded on the film.

Another object consists in the provision of means for adjustablymounting a revoluble film receiving member or sleeve on a station- .garymember, so, that the revoluble member is capable of use with all tvnesand sizes of films. I H f A in rt oer object coinprehends the rovisionof means for looselv mounting a film receiv- 5ing sleeve onflastationary member, so that the sleeve will be propelled only by thepressure nd passing of the film thereon and thus insure clear and,accurate reproduction of the sound recorded on'the film. q: A. furtherobject is to provide a movable member for supporting the sides of asound film as the latter passes between the optical system and a lightsensitive element to maintain the surface of the film smooth and re' 5move any bends or kinks that might otherwise betorm-ed'in-the film andwould inter fere with the efiicientoperation of the reproducer. p v 4 'Astill further object of the invention is to "epro vide a sectionalmember or sleeve for guiding thefilm past'th e optical system, thesect-ions of the sleevebeing suitably spaced to receive the sound trackportion of the film. Ad." tionally, meansare provided for mainng thesound track portion in proper ment with the optical system, so as topreclude tie possibility of the sound track portion being deflected fromits path.

ltherobjects and advantages of the invention will become apparent fromthe follow ance with the sound wave variations ing description whentaken in conjunction with the accompanying claims and drawing.

Referring to the drawing in which are shown several preferredembodiments of the development Figure l is a side view of a reproducingapparatus with my invention applied thereto.

Figure 2 is a sectional view taken substantially along the line 2-2 ofFigure 1-.

Figure 3 is a view similar to Figure 2 of a modified form of theinvention.

Figure 4 is a horizontal sectional view of a further modification.

Referring to the drawing in which like numerals indicate like parts inthe several views, 10 denotes an optical system of any conventional orwell known type, which is arrangedto project a concentrated beam oflight 11 on the sound track portion 12 of a sensitized film 13.

The acoustically modulated light as it passes through the sound trackportion 12 impinges upon a light sensitive element 14: for varying anelectrical current in accordproduoed on the track portion 12. p

In order that the recorded sound such as speech, music or the like mayaccurately and clearly be reproduced, the film 13 is preferably carriedover the guide roller 15 and firmly pressed against one side of arevoluble member 16 as it passes between the optical system 10 and thelight sensitive element 14, so that the focal point of the beam oflight, will be projected only on the track portion 12 of the film. Aguide roller 17 receives the film as it is fed beneath the revolublemember 16 and conducts the film between a drive sprocket 18 and apressure roller 20.

The guide roller 17 may be mounted so as to "be horizontally adjustablein order to vary the tension of the film as it is driven past theoptical system 10 by the sprocket 18.

The revoluble member 16 which may be in the form of a sleeve or drum, ispreferably composed of the sections 21 and 22 (Fig. 2) that are freelymounted on a hollow stationary member 23 supported by a shaft 24suitably secured to the sound head portion of the machine, not shown.

The periphery of the stationary member 23 is preferably provided withreduced extern atly threaded end portions 25 and 26, and an enlargedmedial t flange portion 27. Internally threaded locking. collars orrings 28 and'29 are arranged to fiton the reduced portions 25 and'26respectively, of the s'tationary; member 23, and have their inner endsso shaped as to coactwith the opposed surfaces 3 of the medialportiomfiyto form aniannular":

socket 30 that 'coacts with a complementary formed socket 31 formed intheopposed 'sum face of sections- 2l andh22 of the revoluble I member 16to provide a race wayf orthe'b all bearings=325 thus permitting therevoluble member 16 to be freely mounted on the sta tionary member 23and} be propelled solely V by reason of itsfric'tional engagement with.1 *the film 13 as thelatter is driven .by the- J sprocket wheel 18. Y

Theadj acentsides ofthe sections 21 and 22 of thesleeve '16 arespacedrelative to each other to form: an annular openingv 33 (Figure 2)whiclr'openingsis arranged tobe in alignment with-an aperture 34formedinthe hollow member 23 that allows the beam of light 11 from theoptical/systemto be pro- 3 V jectedjon-the light sensitiveelement 14vpositioned within the hollow-- member-123.

of' thewfilmi for. maintaining. the lat The sound track portion 12 ofthe registers-withthe opening 33 so that when tlie filmr-passes betweenthe optical system 10 and'itheeaperture 32in the stationary member 23,the focal point of the beam-ofilight'll-will' be "thrown upon-the;soundtrack portion :12 V g and the inodul-ated'light as it strikes thelight sensitive-elmentf14-will set upa current corresponding .infrequency variations to the sound; recorded on the-track portion 12 7"4o 7 7 through which it passes; I

"The-section 21 of" the .revoluble member 16 is preferably formed'with:an annular flange 35 whichreceives the adjacent marginal edge ter inproper position during-the-reproducingrop eratio-m-thusainsuringwthesounditrack portion '12 remaining at all times in registra-. tron :Wltlfthe open1ng133 "so I as to eliminate g V the danger'offthe sounditrackportion being moved'or-defiected out of its pathv and engag;ingthesectio'n-i 22, which would-cut; off por= tions of thesound tracklQafrom theaperture 34 and--seriouslyimpair the operation of theapparatus;

The collars -28 and'29;.lcoact with the roll-I ers '32x formaintainingthe sections of the revoluble member 16 in proper position rel- Iative'to-the film and maybe conveniently re I 7' i moved from'thestationary member 23 so as to; dismantle the partsLxMoreover, as the Isections-2L and :22 of the revoluble member I arefreely movableonthesleeve23 they insure a very smooth?reproducing.;.operation Y and alsotend to eliminate scratching on the film due to the pressurethereofonthesleeve L6.

and the opening 40. I

The sleeve 47 has a shoulder portion. 48

The sections 21and 22 are so spaced and a sitioned to support firmly theends of the film and thus provide means for removing any kinks or bendsthat might otherwise be formed in'the film which would interfere withthe proper operation of the reproducer. V

Figure 3, the hollow stationarymember 36 is fixed to a shaft 37 which inturn is connected I to a portion of the sound head in any suitablemannennot shown; The periphery '38 of the stationary member 36 isexternally threaded as at 39 and has an aperture 40 arranged to be inhorizontal alignment with the optical System10 shown in'Ifigure 1 topermit the, modulated light asit'passes through the sound track-portiono'f'ithe film 41to act upon a lightsensitive element such as aphoto-electric cell or the like to set 'up' currents corresponding tothe frequency variations of the sound record through which the light haspassed.

" In this form oftheinirention; the inner" portion of the film 41frictionally engages the periphery or sleeve 42iof'a'cyli'ndrical guide:member 43 that is pro-videdwith a hub por tion 44'and a bushing45'revolubly mounted l "10 the shaft 37tends to maintain the-member V a43 inproper axial position relativeto the on the shaft 37. A locking,nut' 46secured to stationary member 36.

A sleeve 47 mounted on the periphery 38'of the stationary member36 actsasa support for the outerportion of the film 41and is spaced from-thesleeve 42 to'provide an annular 7 opening 43 that registers with thesound track portion 44 of the film forgreproducing I the sound recordedthereon; in'substantially the same manner as the device Figure 2, whenthe filmis passed between theoptical system thatabuts a complementaryportion 49 0711 theperiphery of the stationary member 36 1 so as tolimit the inward movement off'th'e 7 sleeve, while an internallythreadedwlocking' collar 50 is arranged to fit on the threaded portion39 to removablymaintain the sleeve 7 A flange 51 on'therevoluble 47. inposition;

member 43*acts as'a guide for maintaining theiilm 41 in-pro-perposition. (luringth-e 7 g cording operation. e i g In the modifiedjustable'construction which is. readily adapt ed to be-used with alltypes ands zes of films. In this form of the invention thestationaryform'of the invention il- 7 lustrated in vFigure 4, there .is shown'arradmember52 has its peripheral portion 53 ex-.

ternally threaded throughout its length and formed with an aperture 54;that registers with the optical system in substantially the same manneras the apertures 34 and in the forms previously described. The film as Vit-passes the optical system frictionally engages a sleeve composed ofthe spaced sections and 56 that arerevolubly mounted on two pair ofcollars 57 and 58 respectively, which collars are each formed ofseparate sections and are internally threaded so as to be 7 adjustablysecured to the periphery 53 of the 1 stationary member 52. Ball bearings59 fit V in the race ways formed in the adjacent surfaces 60 of thesleeve sections and the space 61 between each pair of collars 57 and 58so asto insure free rotative movement of the sleeve on the stationarymember.

It willbe seen that the threaded connection of the collars 57 and 58 onthe periphery 53 of the stationary member 52 not only permits axialadjustment of the sleevesections so that the width thereof may be variedto accommodate either a single or double dimensionfilm, but also acts asa locking means for removably securing the sections of the sleeve inposition.

It is to be understood that the forms of the invention herewith shownand described are merely illustrative of preferred embodiments, and thatsuch changes and modifications thereof as fall within the purview of oneskilled in the art may be made without departing from the spirit of theinvention or the scope of the appended claims.

I claim:

1. A reproducing apparatus of the class 7 described, having incombination an optical being spaced from each other ata point inalignment with said aperture, a film arranged to be carried by saidsleeve past the optical system, said film having a sound track portionin alignment with the space between said section, and means forreproducing the sound recorded onthe film'as the latter passes theoptical system.

2. A sound reproducing device of the class described,having incombination an optical system, a stationary hollow. member having anaperture in alignment with said optical system, a sectional sleevesurroundmg said hollow member and revoluble relative there- -6 to, meanson said hollow member for main taining the sleeve in a'predeterminedposition relative tothe hollow member, the adjacentsections of saidsleeve being annularly spaced from each other at'a point in alignmentwith said aperture, a film in frictional engagement with said sleeve forpropelling the latter as the film is carried past the optical system,said film having a sound track portion registering with the spacebetween said sections, and means for adjusting the sections relative toeach other.

3. In combination. with a sound reproducer of the class described, anoptical system, a hollow member having an aperture in the wall thereofin alignment with said optical system, a light sensitive elementassociated with said hollow member, the periphery of said hollow memberbeing exter nally threaded, a cylindrical member revolubly mounted onsaid hollow member, and a collar threaded to an end portion of saidhollow member for maintaining the cylindrical member in position on saidhollow member.

=4. In combination with a sound reproducer of the class described, anoptical system,'a hollow member having an aperture in the wall thereofin alignment with said optical system, a light sensitive elementassociated with said hollowinember, the periphery of said hollow memberbeing externally threaded, a revoluble sleeve mounted on said hollowmember and means threaded to the end portion of the hollow member formaintaining the sleeve in position. i

5.. In combination with a sound reproducer of the class described, an.optical system, ahollow member having an aperturein the wall thereof inalignment with said optical system,- a light sensitive elementassociated with said hollow member, the periphery of said hollow memberbeing externally threaded, a pair of collars threadedly connected to theend portions of'said hollow member, a

sleeve encircling said collars, the opposed surfaces. of said sleeve andsaid collars having annular grooves therein, and ball bearings mountedin said grooves for permitting free movement of the sleeve relative tothe hollow 'member.

- 6. In combination with a sound reproducer of the class described, anoptical system, a hollow member having an aperture in the wall'thereofin alignment with said optical system, a light-sensitive elementassociated with said hollow member, the periphery of said hollow memberbeing externally threaded, a pair of locking collars threaded to the endportions of said hollow member, a sectional sleeve enclosing theperiphery of said hollow member and revolubly mounted relative thereto,the adjacent end sections of said sleeve being annularly spaced at apoint in alignment with said aperture, a film in frictional engagementwith said sleeve for propelling the latter as the film is carried pastthe optical system, said film having a sound track portion registeringwith the space between saidsections and means for adjusting the sectionsaxially relative to each other.

7 .f 'In combination with a sound reproducer or the class described, anoptical system, a hollow member having an aperture in the wallthereof inalignment with said optical system, alight sensitive element associated.

with the liollow'membena sectional sleeve en-' circling the outersurface of said hollow member, the adjacent ends of sald sleeve behi'ngspaced. from each other at a point in portion in alignment with'thespace between with the hollow member, a sectional sleeve encircling theouter surface of said hollow alignment with said, aperture, a filmfriction- V ally engaging said sleeve adjacent said optical system,saidfilm having a sound track said sections, and means on said'sleevefor maintaining the s'oundtrackportion of the film in registration withsaidaperture.

8. In combination with a sound reproducer of the'class described,anoptical systenna hollow member having an aperture in the wall thereofin alignment with said optical system a light sensitive elementassociated member,-the adjacent ends of said sleeve beingspacedfrom eachother at a point 'in alignment with said, aperture, a film frictionallyengaging said sleeve adjacent" said optical system, said film-having asound track portion in alignment with the :space between-said sections,said sleeve having a flange thereon for maintaining the soundtarck-portion of the film in alignment with said aperture.

9; In combination witha sound reproducer of the class described, anoptical system, a hollow member having an aperture in the wall thereofin alignmentwith said optical system, a light'sensitive elementassociated with the hollow member, a sectional sleeve encircling theouter surface of said hollow member, the adjacent ends of said sleevebeing spaced from each other at a point in alignment .withfsaidaperture, a film frictionally engaging said sleeve adjacent said opticalsystem, said'film having a sound track pori tion inalignment with thespace-between said sections, the inner section of said'sleeve hava ingan annular flangearrangedto engage said i film and maintainthesoundtrackportion 7 thereo-fin alignment with said aperture. 10/ In asound reproducer, means for guid ing' and maintaining the film in properpos'i tion'relative to the optical system, comprisinga fixed hollowcylindrical member having an opening inlthe periphery thereof, asectional sleeve encircling said stationary mem ber and revolublerelative thereto','the adj acent ends'of said sleeve being spacedfromeach other at a point in alignment with said opening means foradjusting the sections of the sleeve relativeto each other, and means 7formaintaining the sound track portion'of aifilm in registration withsaid opening.

In testimony whereof I have hereunto set my hand. 7

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